Lubricating attachment



Mara 16, 1943- M. ROSENBERG ET L 2,314,163

LUBRICATING ATTACHMENT 1 Filed June 23, 1941 2 Sheets-Sheet 1 MAX ROSE45 NBERG L Y 9 JOSEPH WEISSBLATT} INVENTORS ATTORNEY M. FIQOSENBIERG ETAL 2,314,163

LUBRICATING ATTACHMENT March 16, 1943.

Filed Jun 25, 1941 zsheets-sneet 2 MAX ROSENBERG [JOSEPH WEISSBLATTINVENTORS 31 M AT TOPNEY Patented Mar. 16, 1943 LUBRICATING ATTACHMENTMax Rosenberg and Joseph Weissblatt, New York, N. Y.

Application June 23', 1941, Serial No. 399,391

Claims. (Cl. 112-256) This invention relates to a lubricating attachmentfor the cutting members of pinking attachments used in connection withsewing machines.

In pinking attachments having V-shaped cutting members and used atpresent with sewing machines, the cutting edges dull quicklynecesitating frequent changing of the cutting members and causing muchloss in the running time of the machine. This quick dulling of thecutting edges is caused by the rubbing of the vertical front edges ofthe movable cutting member against guide members extending upwardly fromthe female cutting member.

An object of this invention is to provide a simple compact lubricatingappliance which may be removably mounted on the pinking attachment baseand comprising two arms having their free end portions positioned inV-shaped form and terminating in pockets for felted fibers which are incontacting relation with the V- shaped cutting edges of the movablecutting member.

Another object of this invention is to provide a resilient means forcausing a frictional pressure between the felted fibers and the V-shapedcutting edges.

Another object of this invention is to provide means for regulating thepressure between the felted fibers and the V-shaped faces of the movablecutting member.

With the above and other objects in view, the invention will behereinafter more particularly described, and the combination andarrangement of parts will be shown in the accompanying drawings andpointed out in the claims which form part of this specification.

Reference will now be hadto the drawings, wherein like numerals ofreference designate corresponding parts throughout the several views, inwhich:

Figure 1 is a side elevation of a pinking attachment in operatingposition in a sewing machine, with the lubricating attachment applied tothe cutting member.

Figure 2 is a cross-sectional view, the section being taken as on line22 in Figure 1.

Figure 3 is a cross-sectional view, the section being taken as on line3-3 in Figure 2.

Figure 4 is a plan view of the lubricating device removed from thepinking attachment, the front screws being removed to permit swingingmotion of the arms.

Figure 5 is a plan view of a modified lubricating attachment, partlybroken away to show the interior of one of the pockets.

serving to limit the upward movement of the cutter arm M to apredetermined maximum, as is well known in the art.

At the free end ll of the cutter arm It there have been provided arms l8designed to form guide means for a bar pivotally mounted on a pin 29extending through said arms.

A male cutting member 2! of triangular prismatic form is fastened to thebar I9 by means of a bolt 22. A female cutting member 23 is fastened tothe base I2 and is provided with a V-shaped opening 24 and with upwardlyextending guide members 25, forming continuations of and having the sameinclination as the sides of the V-shaped opening 24. The guide members25 are spaced away from the apex of the opening 24 and extend upwardly adistance sufiicient so as to be constantly in engagement with the rearportions of the cuttingwalls of the male cutting member 2|, and serve tomaintain the male and female cutting members in alignment.

A ribbon-like leaf spring 26 has been fastened to the cutter arm I4- andextends angularly against-the bar l9 and serves to swing the cuttingmember 2! outwardly about the pin 20 into forced engagement with thefemale cutting member 23.

Figure 1 shows the pinking attachment It mounted on the base plate 30 ofa sewing machine SI and is attached thereto by means of a bolt 32passing through an elongated aperture in the base [2 of the pinkingattachment lit.

The cutter arm M has been provided at its upper portion with abifurcated extension 33 having a pin 3%. A link 35 has been pivotallymounted on the pin 34 and is connected at its upper end to the actuatingmechanism of the sewing machine, as is well known inthe art, shown inPatent No. 1,922,453.

The lubricating attachment H comprises a channel-shaped base 40 havingan elongated slot it through which passes the bolt 32 and by means ofwhich the lubricating attachment H is ,secured to the base [2 of thepinking attachment H1. The flanges 42 of the channel-shaped base 46 havebeen spaced apart so as to engage the upright sides of the base l2.

Arms 43 have been secured to the lubricating attachment base 46 by meansof screws 44. The arms 43 are elongated and extend in the direction ofthe male cutting member 2!. The free end portions of the arms 43 arepositioned in V- shaped form and terminate in separate and independentrhomboid pockets 45 serving to receive substantially rhomboid shapedblocks 46 of felted fibers, in forced engagement.

The felted fiber blocks 46 extend outwardly from the pockets 45sufficiently to form a V- shaped opening between them wherein thecutting walls of the male cutting member H are frictionally engaged.

As shown in Figure 3, the lubricating attachment I l is slidably mountedon the base l2vwith the flanges 42 in engagement with said base. It isthus possible to longitudinally adjust the lubricating attachment II onthe base l2 to provide the desired frictional pressure engagementbetween the felted blocks 46 and the male cutting member 2|.

It is to be noted that a presser-foot 41 extends under one of the arms43 and that the arms are made of spring steel to permit raising one ofsaid arms when the presser-foot is raised.

It is to be noted that while we prefer to use blocks of felted fiber,that other lubricant absorbing and storing means may be used in thepockets. Holes 48 in the upper layers of the pockets 45 are provided forperiodically supplying oil to the felted fiber blocks.

Figure 5 shows a modified lubricating attachment 56 comprising a base 5|having spring arms 52, 52' mounted on shoulder screw pivots 53. The armshave radially positioned slots 54 adapted for engagement With shoulderscrews (not shown) threaded into tapped holes 56.

As best shown in Figure 5, it will be seen that the junction 46' of thefelted blocks 46 is of considerable linear extent or depth to providesuiiicient contact between the felt blocks at the apex of the cuttingmember 2!.

The arms terminate in independent rhomboid pockets 55 similar to theindependent pockets 45 shown in Figure 4; The arm 52 has one end of acoil spring 51 secured thereto by a screw 58. The other. end oftheispring 51 is secured to a threaded bar 59 which passes through ears66 integral with the arm 52. A wing nut 6! in threaded engagement withthe threaded end of the bar 59 serves for adjusting the spring arms soas to bring the felted fiber blocks 46 in frictional contacting relationwith the male cutting member 2|. The wing nut serves as a means forregulating the pressure between the felted fibers against the V-shapedfaces of the movable cutting member.

The slots 54 are open at one end to permit swinging of the arms aboutthe pivots 53, clear of the cutting member 2|. It is to be noted thatthe spring 51 serves as a means for the automatic transverse adjustmentof the arms 52, 52 and the felt blocks 46. It is also. to be noted thatthe shoulder screws 53 permit free pivotal movement of the arms 52, 52'when they are drawn together by the spring 51.

In accordance with the patent statutes we have described and illustratedpreferred embodiments of our invention, but it will be understood thatvarious changes and modifications can be made therein without departingfrom the spirit of the invention as defined by the, appended claims.

We claim:

1. In a pinking attachment having a base and V-shaped cutting membersone of which is vertically reciprocable, a lubricating attachmentadapted to be mounted on said base and having arms extending therefromin the direction of said reciprocable cutting member, said arms havingtheir free end portions positioned in V-shaped form and terminating inseparate and independent pockets on opposite sides of said reciprocablecutting member, blocks of felted fiber mounted in forced engagement insaid pockets and extending outwardly from said pockets sufficiently toform a V-shaped opening between them defined by two felt surfaces, thesaid felt surfaces contacting along a common vertical plane, and meansfor adjusting said lubricating attachment lengthwise of said pinkingattachment base to repeatedly bring the walls of said V-shaped feltedopening into engagement with the outer surfaces of said reciprocablecutting member whereby the cutting edges of said reciprocable cuttingmembers are lubricated.

2. A lubricating device for a pinking attachment having cutting membersone of which is vertically reciprocable, comprising means for mountingsaid lubricating device on the pinking attachment and having springmeans extending therefrom in the direction of said reciprocable cuttingmember, said spring means having their free end portions positioned inconverging angular form and terminating in pockets on opposite sides ofsaid reciprocable cutting member, lubricant absorbing means mounted insaid pockets and extending outwardly sufficiently to form a V-shapedopening between them, and means for adjusting said lubricatingattachment to bring the walls of said V-shaped lubricant absorbing meansinto engagement with the outer surfaces of said reciprocable cuttingmember.

3. A lubricating device for a pinking attachment having cutting membersone of which is vertically reciprocable, comprising means for mountingsaid lubricating device on the pinking attachment and having spring armsextending therefrom in the direction of said reciprocable cuttingmember, said spring arms having free end portions positioned inconverging angular form and terminating in pockets on opposite sides ofsaid reciprocable cutting member, lubricant absorbing means mounted insaid pockets and extending outwardly sufficiently to form a V-shapedopening between them, and means for automatically adjusting said arms tobring the walls of said V- shaped lubricant absorbing means intofrictional engagement with both cutting sides of said reciprocablecutting member.

4. A lubricating device for a pinking attachment having cutting membersone of which is vertically reciprocable, comprising means for mountingsaid lubricating device on said pinking attachment and having springarms extending therefrom in the direction of said reciprocable cuttingmember, said spring arms having free end portions positioned inconverging angular form and terminating in pockets on opposite sides ofsaid reciprocable cutting member, at least one of said arms beingmovable vertically at its free end, lubricant absorbing and storingmeans in said pockets and extending outwardly sufficiently to form aV-shaped opening between them, and means for automatically adjustingsaid arms to bring said V-shaped lubricant absorbing means into desiredfrictional engagement with the outer surface of said reciprocablecutting member.

5. A lubricating device for a pinking sewing machine having cuttingmembers one of which is reciprocable, comprising means for mounting saidlubricating device on the pinking machineand having arms extendingtherefrom in the direction of said reciprocable cutting member, saidextending arms having free end portions positioned .in convergingangular form and terminating in pockets on opposite sides of saidcutting member, blocks of felted fiber mounted in forced engagement insaid pockets and extending outwardly from said pockets sufiiciently toform a felted V- shaped opening between them defined by two feltsurfaces, the said felt surfaces contacting along solely byrsaid' feltsurfaces and being wholly out of contact with said arms or carriers ofsaid blocks of felted fiber. MAX ROSENBERG.

JOSEPH WEISSBLATT.

